Catalytic assembly

A method of preparing a catalytic assembly, the method comprising the steps of:

• (i) providing a porous electrically conductive substrate having a three dimensional interpenetrating porous structure and having a first average pore diameter (PDSUB), and
• (ii) coating substrate surfaces throughout the substrate including surfaces of the pores in the substrate with a porous metallic composite having a second average pore diameter (PDPMC);
• the porous metallic composite coating being adapted to eXhibit catalytic activity when electric charge is applied, and wherein step (ii) does not include the use of binders to adhere the porous metallic composite to substrate surfaces;
• the porous metallic composite being amorphous and having a three dimensional interpenetrating porous structure, and the PDPMC being sufficiently smaller than the PDSUB to allow the porous metallic composite to coat surfaces of pores in the substrate, the catalytic assembly having a three dimensional interpenetrating porous structure.